Thrombin-activatable fibrinolysis inhibitor protects against acute lung injury by inhibiting the complement system

Acute lung injury (ALI) is a devastating disease with an overall mortality rate of 30 to 40%. The coagulation/fibrinolysis system is implicated in the pathogenesis of ALI. Thrombin-activatable fibronolysis inhibitor (TAFI) is an important component of the fibrinolysis system. Recent studies have sho...

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Veröffentlicht in:American journal of respiratory cell and molecular biology 2013-10, Vol.49 (4), p.646-653
Hauptverfasser: Naito, Masahiro, Taguchi, Osamu, Kobayashi, Tetsu, Takagi, Takehiro, D'Alessandro-Gabazza, Corina N, Matsushima, Yuki, Boveda-Ruiz, Daniel, Gil-Bernabe, Paloma, Matsumoto, Takahiro, Chelakkot-Govindalayathil, Ayshwarya-Lakshmi, Toda, Masaaki, Yasukawa, Atsushi, Hataji, Osamu, Morser, John, Takei, Yoshiyuki, Gabazza, Esteban C
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container_issue 4
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container_title American journal of respiratory cell and molecular biology
container_volume 49
creator Naito, Masahiro
Taguchi, Osamu
Kobayashi, Tetsu
Takagi, Takehiro
D'Alessandro-Gabazza, Corina N
Matsushima, Yuki
Boveda-Ruiz, Daniel
Gil-Bernabe, Paloma
Matsumoto, Takahiro
Chelakkot-Govindalayathil, Ayshwarya-Lakshmi
Toda, Masaaki
Yasukawa, Atsushi
Hataji, Osamu
Morser, John
Takei, Yoshiyuki
Gabazza, Esteban C
description Acute lung injury (ALI) is a devastating disease with an overall mortality rate of 30 to 40%. The coagulation/fibrinolysis system is implicated in the pathogenesis of ALI. Thrombin-activatable fibronolysis inhibitor (TAFI) is an important component of the fibrinolysis system. Recent studies have shown that the active form of TAFI can also regulate inflammatory responses by its ability to inhibit complement C3a, C5a, and osteopontin. We hypothesized that TAFI might have a protective role in ALI. To demonstrate this hypothesis, the development of ALI was compared between wild-type (WT) and TAFI-deficient mice. ALI was induced by intratracheal instillation of LPS. Control mice were treated with saline. Animals were killed 24 hours after LPS. The number of inflammatory cells and the concentration of total protein and inflammatory cytokines were significantly increased in bronchoalveolar lavage fluid from LPS-treated, TAFI-deficient mice compared with their WT counterparts. Significantly higher concentrations of C5a were found in bronchoalveolar lavage fluid and plasma in LPS-treated TAFI knockout mice compared with WT mice. Pretreatment with inhaled C5a receptor antagonist blocked the detrimental effects of TAFI deficiency to levels found in WT mice. Our results show that TAFI protects against ALI, at least in part, by inhibiting the complement system.
doi_str_mv 10.1165/rcmb.2012-0454OC
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The coagulation/fibrinolysis system is implicated in the pathogenesis of ALI. Thrombin-activatable fibronolysis inhibitor (TAFI) is an important component of the fibrinolysis system. Recent studies have shown that the active form of TAFI can also regulate inflammatory responses by its ability to inhibit complement C3a, C5a, and osteopontin. We hypothesized that TAFI might have a protective role in ALI. To demonstrate this hypothesis, the development of ALI was compared between wild-type (WT) and TAFI-deficient mice. ALI was induced by intratracheal instillation of LPS. Control mice were treated with saline. Animals were killed 24 hours after LPS. The number of inflammatory cells and the concentration of total protein and inflammatory cytokines were significantly increased in bronchoalveolar lavage fluid from LPS-treated, TAFI-deficient mice compared with their WT counterparts. Significantly higher concentrations of C5a were found in bronchoalveolar lavage fluid and plasma in LPS-treated TAFI knockout mice compared with WT mice. Pretreatment with inhaled C5a receptor antagonist blocked the detrimental effects of TAFI deficiency to levels found in WT mice. 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Significantly higher concentrations of C5a were found in bronchoalveolar lavage fluid and plasma in LPS-treated TAFI knockout mice compared with WT mice. Pretreatment with inhaled C5a receptor antagonist blocked the detrimental effects of TAFI deficiency to levels found in WT mice. 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The coagulation/fibrinolysis system is implicated in the pathogenesis of ALI. Thrombin-activatable fibronolysis inhibitor (TAFI) is an important component of the fibrinolysis system. Recent studies have shown that the active form of TAFI can also regulate inflammatory responses by its ability to inhibit complement C3a, C5a, and osteopontin. We hypothesized that TAFI might have a protective role in ALI. To demonstrate this hypothesis, the development of ALI was compared between wild-type (WT) and TAFI-deficient mice. ALI was induced by intratracheal instillation of LPS. Control mice were treated with saline. Animals were killed 24 hours after LPS. The number of inflammatory cells and the concentration of total protein and inflammatory cytokines were significantly increased in bronchoalveolar lavage fluid from LPS-treated, TAFI-deficient mice compared with their WT counterparts. 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subjects Acute Lung Injury - immunology
Acute Lung Injury - metabolism
Animals
Blood Coagulation - immunology
Bronchoalveolar Lavage Fluid - immunology
Carboxypeptidase B2 - deficiency
Carboxypeptidase B2 - metabolism
Complement C5a - immunology
Complement C5a - metabolism
Cytokines - immunology
Cytokines - metabolism
Fibrinolysis - immunology
Inflammation - immunology
Inflammation - metabolism
Lipopolysaccharides - immunology
Lung - immunology
Lung - metabolism
Male
Mice
Mice, Inbred C57BL
Mice, Knockout
Neutrophils - immunology
Neutrophils - metabolism
Pneumonia - immunology
Pneumonia - metabolism
Thrombin - immunology
Thrombin - metabolism
title Thrombin-activatable fibrinolysis inhibitor protects against acute lung injury by inhibiting the complement system
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